The system would link items -- like a wallet, purse, personal data assistant, personal computer, watch, credit card, keys, and cell phone -- using sensors that can track and record changes in environment and condition.

But Apple's MMD sensors can also attach to packages or furniture so you can track how your mailman or delivery guy is handling your belongings. If an unauthorized person tried to remove the sensor, it would alert you, according to the patent filings.

"A MMD of the invention can attach to furniture to monitor shipping of furniture. If the furniture were dropped, an impact event occurs and is recorded within the MMD, or transmitted wirelessly, with an associated time tag," the document reads.